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/*
FUNCTION
<<fsetpos>>---restore position of a stream or file
 
INDEX
	fsetpos
 
ANSI_SYNOPSIS
	#include <stdio.h>
	int fsetpos(FILE *<[fp]>, const fpos_t *<[pos]>);
 
TRAD_SYNOPSIS
	#include <stdio.h>
	int fsetpos(<[fp]>, <[pos]>)
	FILE *<[fp]>;
	fpos_t *<[pos]>;
 
DESCRIPTION
Objects of type <<FILE>> can have a ``position'' that records how much
of the file your program has already read.  Many of the <<stdio>> functions
depend on this position, and many change it as a side effect.
 
You can use <<fsetpos>> to return the file identified by <[fp]> to a previous
position <<*<[pos]>>> (after first recording it with <<fgetpos>>).
 
See <<fseek>> for a similar facility.
 
RETURNS
<<fgetpos>> returns <<0>> when successful.  If <<fgetpos>> fails, the
result is <<1>>.  The reason for failure is indicated in <<errno>>:
either <<ESPIPE>> (the stream identified by <[fp]> doesn't support
repositioning) or <<EINVAL>> (invalid file position).
 
PORTABILITY
ANSI C requires <<fsetpos>>, but does not specify the nature of
<<*<[pos]>>> beyond identifying it as written by <<fgetpos>>.
 
Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
*/
 
#include <stdio.h>
 
int
_DEFUN (fsetpos, (iop, pos),
	FILE * iop _AND
	_CONST fpos_t * pos)
{
  int x = fseek (iop, *pos, SEEK_SET);
 
  if (x != 0)
    return 1;
  return 0;
}